it is doing a few things, and we have already fixed stuff on it. New fuel pump, fuel filter, spark plugs and wires and we replaced some hose that was cracked but it's still screws up. It drives fine around town but every time my Friend tries to take it to work down the highway.. it breaks down. Then it will start again and drive after it sits for a bit. We have had a few suggestions on what the problem could be, but I would like to know what you guys think

 

Possibly Crank Or Cam Sensor. Does It Have The 3.0 Or 3.3,3.8

 

Guess Im not sure I didnt ask. Would that really be a problem with high speed driving? Im a ag Mechanic. I dont know this car crap haha